CRESCENT STEPHAN MODEL �A� ARTICULATOR IS USED FOR PARTIALS, CENTER SPRING WITH ADJUSTABLE TENSION, SMOOTH BRASS CASTINGS WITH NICKEL PLATING, CENTER BAR IN BOTH UPPER & LOWER BOW FOR MAXIMUM PLASTER RETENTION & STRENGTH. WIDTH AT THE JOINT OF 29, & VERTICAL SPAN WHEN BOWS ARE PARALLEL OF 21/8". REPRODUCE ALL ANATOMICAL MOVEMENTS. UPPER AND LOWER SECTIONS MAY BE SEPARATED OR ASSEMBLED QUICKLY. OPEN CONSTRUCTION PROVIDES FREE ACCESS TO LINGUAL SURFACES. ANATOMICAL IN EVERY RESPECT